FGFS-4.1/gr-air-modes
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Use lpfilter when using RTL source

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This commit is contained in:
Nick Foster 2012-06-13 14:06:08 -07:00
parent 6c4eb9d6d3
commit 0310c3c81d
1 changed files with 11 additions and 8 deletions
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19
apps/uhd_modes.py
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@ -90,7 +90,9 @@ class adsb_rx_block (gr.top_block):
self.u.set_gain_mode(0) #manual gain mode
self.u.set_gain(options.gain)
print "Gain is %i" % self.u.get_gain()
use_lpfilt = True
else:
if options.filename is not None:
self.u = gr.file_source(gr.sizeof_gr_complex, options.filename)
@ -109,16 +111,17 @@ class adsb_rx_block (gr.top_block):
self.demod = gr.complex_to_mag()
self.avg = gr.moving_average_ff(100, 1.0/100, 400)
#the DBSRX especially tends to be spur-prone; the LPF keeps out the
#spur multiple that shows up at 2MHz
#self.lpfiltcoeffs = gr.firdes.low_pass(1, rate, 1.8e6, 100e3)
#self.lpfilter = gr.fir_filter_ccf(1, self.lpfiltcoeffs)
self.preamble = air_modes.modes_preamble(rate, options.threshold)
#self.framer = air_modes.modes_framer(rate)
self.slicer = air_modes.modes_slicer(rate, queue)
self.connect(self.u, self.demod)
if use_lpfilt:
self.lpfiltcoeffs = gr.firdes.low_pass(1, 5*rate, 1.2e6, 300e3)
self.lpfilter = gr.fir_filter_ccf(1, self.lpfiltcoeffs)
self.connect(self.u, self.lpfilter, self.demod)
else:
self.connect(self.u, self.demod)
self.connect(self.demod, self.avg)
self.connect(self.demod, (self.preamble, 0))
self.connect(self.avg, (self.preamble, 1))